You used this document as evidence to support your argument. Of course the credibility and validity of the document is a subject for discussion.
Also It’s not good evidence, but a valueable piece of a larger puzzle, where one understands the dynamics of political economy and has to piece it together through these. If you’d read any theory at all, you know history is always written by the dominant class and one has to read through the lines with documents like this.
We have no idea who actually wrote this document. Just further pointing out how useless it really is. And believe me I'd be really interested to know the backstory of the document from a historical pov.